Film envelope



NV 22, 1938 N. P. BILLING ET Al.

FILM ENVELOPE y Filed Aug. 4, 1957 22e- ,zs l5 if q n@ 5 n QM M @um .1 z

Patented Nov. 22, 1938 j UNIT so i STATE-s FILM ENVELOPE Noel Pemberton Billing and Ambrose Henry Tap-L H per, London, England; said Tapper assigner to said Billing Y Application August .4, 1937, serial No. 157,440 f In Great Britain August 13, 1936 A claims. (01. sis- 66) This invention consists in improvements in or relating `to photographie-film packages of the type comprising inner and outer envelopes, the outer one of which is formed with a mask through which the lm or other light-sensitive material may be exposed when the envelopes are separated apart, as for instance in a construction 4 somewhat similar to that described in prior United States Letters Patent Nos.V 2,017,709 and 2,070,778 of Noel Pemberton Billing, dated Oc- `tober l5, 1935, and February 16, 1937, respec-v ably the tongue is formed from or Vis provided on the outer surface of what may be regarded as the back of lthe outer envelope and the loop is on the inner envelope. Y

In describing the invention the upper edge of the outer envelope will be considered as that edge or margin at the opening of the envelope through which the inner envelope is entered and of the package in a camera.

this edge will generally be uppermost in the use The lower edge of the inner envelope will be considered as that edge which `is remote from the upper edge of the outer envelope when the two are closed one into the other.

In order that the invention may be more clearly understood a preferred construction will now be described with the aid of the accompanying drawing, in Which- Figure 1 illustrates the blank from which the l Aouter envelope is formed, and

i Figures `2 to 5 illustrate successive steps in the assemblage of the package, Figure 5 being a sec- `tion on the line 5-5 of Figure 4.

Like reference numerals indicate like parts throughout the several figures of the drawing.

In the example illustrated in Figures 1 to 5 the inner envelope is a plain envelope open only at its lower end with an aperture 50 formed in the material of what` may be considered as the rear wall of the envelope, that is that wall remote from the masked opening in the outer envelope to be described below. The inner envelope otherwise may be formed inany other preferred manner and adhesive or overlapping and interlocking flaps may be employed to complete the folding and closure of theV inner `envelope in a mannenwell known and well understood.

The outer'envelope comprises four panels 24, 25, 25 and 2l, and in panel 25 an aperture 28 is provided to constitute. a mask through which the surface of a sensitized sheet of material 29 will be exposed when the inner envelope is withdrawn. VAt the lower edge of the mask a flap35 is provided which is folded over along the fold-line 3l to afford a means for effecting a light-seal along the lower margin ofthe opening. i

`Each of the side panels 2liA and 26 is slotte at 5l to provide tongues 52 atthe outer margins of the panels. i

In assembling the package the light-sensitive material 29 is placed on the flap 2l with the sensitized surface. uppermost and is held at one edge in fold 34 along which the panel 2l is subsequently folded to overlie panel 25. At its opposite edge the material 29 is retained by an loverturned tongue portion 53 cut from the material of panel 2l. This tongue portion does not extend the full Width of the panel but is located in the central portion thereof. After placing the material 29 in position in the manner just de scribed the inner envelope is passed over the panel to enclose the light-sensitive material and the panel together with the inner envelope is then folded over panel 25 along line 34.

Panels 24 and 25 are next folded over panel 2l and in so doing tongues 52 are both inserted.l through slot 5U in the rear wall of the inner envelope. Extension flaps 54 projecting from the lower edges of the inner portions of panels 24 and 26 are broughtover the front 'edge of the envelope and are secured thereto by adhesive or in any other preferred manner. For example, an` adhesive label may be pasted over the rear iiaps 24 and 26 after assemblage to hold the parts of the Vpanel firmly in place and if desired a portion of the label can extend to the upper edge of the inner envelope to be removed therefrom prior to the separation of the envelopes for exposure.

In the construction of Figures 1 to 5 the upper extremities of slots 5I serve to limit the degree of withdrawal of the inner envelope 20 and to prevent its complete withdrawal from the outer envelope, and the permissible degree of separation can therefore be determined by the position of the upper ends of slots 5l.

rItrnust be realized that Figure 5 indicates a sectional view in a somewhat schematic manner with all the various layers of the package separated apart in order to show them clearly. In practice, however, the package will be very thin and successive layers will be more or less in rubbing contact flat against one another. In the construction described the inner envelope forms a complete enclosure for the light-sensitive material 29 when the package is closed and consequently pressure on opposite lateral edges of the package, such as would tend to bulge the margins of the masked opening 28, will have no ill eiect on the material 29 owing to its complete enclosure in the inner envelope.

We claim:

1. A photographic package comprising relatively sldable inner and outer envelopes each having an open end and whereof the inner envelope serves to enclose the light sensitive material and the outer envelope has one wall formed as a mask through which the light sensitive material is exposed when the inner envelope is slidably withdrawn from the outer envelope, and comprising a tongue carried by the outer surface of what may be regarded as the back of the outer envelope, and a loop on the inner envelope through which the tongue will slide as the envelopes are moved relatively to one another as during separation for the purpose of exposure, which tongue and loop serve to limit said movement of separation.

2. Av photographic package according to claim 1 in which the ilexible tongue is formed ntegrally with the outer surface of what may be regarded as the back of the outer envelope. y 3. A photographic package according to claim l in which the flexible tongue is formed integrally with to form part of the outer surface of K what may be regarded as the back of the outer 

